tests: remove expectedFailure from test_051_qrexec_simple_eof_reverse
tests: remove expectedFailure from test_051_qrexec_simple_eof_reverse

This is already fixed in R3 qrexec code.

woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin